Liberty Lake, WA 99027 Frost Dates
When can you plant in Liberty Lake, WA?
The last spring frost here typically falls around 04/26, about 241 days from today. The first fall frost typically arrives around 10/15, about 170 frost-free days later.
Liberty Lake sits in USDA Zone 6b (-5 to 0°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a forecast.
What to do before the first frost
About 7 weeks of growing season left in Liberty Lake before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
How much risk comes with planting early here
04/26 is the middle of 30 years of NOAA records, not a promise. Plant by 04/10 and you're betting against frost in roughly 9 years out of 10. 05/10 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Liberty Lake compares
At roughly 170 frost-free days, Liberty Lake places 28,940 of 40,283 ZIP codes in this dataset. Within WA, it ranks 499 of 700.
Learn more
local microclimates covers what one yard in Liberty Lake can differ from the 99027 normal. zone vs. frost date covers why Zone 6b and Liberty Lake's frost date answer different questions.